Hi, I just found this site and hope you guys can help me out here. My '86 Toyota PU has a 22RTE engine and I just had the head gasket and timing chain replaced at 230,000 miles. While I was at it, I replaced the cat converter and muffler and most of the pipe. Within 100 miles of this service, the turbo has stopped giving me boost. We tested the impeller and it builds to the correct pressure and seems to work fine. When I drive, though, I can't hear the usual whine and there is no burst of acceleration to press me into the back of my seat. But the boost light comes on and everything "acts" normal. Is there some sensor or diverter or switch that I am unaware of? I am hoping there is a guru among you that will educate me in this fine work of art. Thanks.